Stereoscopic measuring instrument



Aug. 7, 1928. A 1,679,661

R. HuGERsHoFF STEREOSCOPIC MEASURING f INSTRUMENT f Filed June l, 1927 Patentedy Aug. ,7, 1928.

uNi'iiazDI .STATES PArE-Nr-oF-Fic.

REINH'ARD HUGERSHOFF, OF DRESDEN, GERMANY.

Application led- June 1, 1927, Serial No. 195,822, and in Germany October 11, 1926.

When observing a pair of stereoscopic images, for obtaining the, normal stereoscopic impression, it is in general necessary for the single image taken from the left- 5 hand position to be presented tothe left eye and that t-aken from the right-hand position to the right eye. An interchange of the position of the single images-would produce a' pseudo-stereoscopic impression. This case l occurs in the continuous measurement of pairs of aerial images ab, be, ed, the separate images a, b, c, d, of which belong to a continuous series of overlapping images. If, after the orientation of the pair of images l a, b the next image cis to be .joined on to the already orientated image I), the image c must'be inserted in the left-hand carrier of the measuring instrument after the removal of the image a, so that it will lie, not in its natural position, but to the left of the previous image b In order to obtain the normal stereoscopic effect with images placed in the carriersw in the opposite position to that in which they were taken, as welljas with those placed in the correct position, according to the present invention the pencil of rays coming from the right-hand image must be conveyed to the le t eye and vice versa. This is effected by introducing a reflector (refiecting system) or prism (prism system) normally belonging to the path of rays of the right-hand lnicroscope into the (path of rays of the left-hand microscope an time inserting a reflector (reflecting system or prism system) normally belonging to the path of ra s of the left-hand microscope into the path o rays of the ri ght-hand microscope.

l'n the accompanying drawing a construc- 40 tional example of the invention is shown, in

which the prisms are .changed over simultaneously, in sections through' the microsco e axes,-

figure 1 showingy the arrangement of the prisms in the normal case, when the images are inserted as originally taken, and

Figure 2 the case in which the images are interchanged. f L

1 1 are the measuring images, of which P the objectives 2, 2 pro'ect real images at 3,

3', which images arel o served bymeans of eye-pieces 4,14. -In the path Q of the rays within the microscopes are the prisms, `6, 7, 5 6 7', of which the prisms 6 and 7,. 6

and 77 aire fixed while the prisms 5, 5 which are fixed on the plates 8, 8', are'capable of subsequently or at the same being displaced with respect to one another. The prisms are displaced by means of the lever 9 which `turns a pinion 10 which meshes with the toothed edges 11, 11 of the prism carriers 8, '8'. l

When, as indicated above, the measuring images themselves are at 1, 1 the adjusting mar :s of the measuring microscopes must be positioned at 3, B. Preferably the measuring images should be so positioned that the real images of them are projected at 1, 1 by means of the separate lens systems. -In this case the adjusting marks may be positioned at 1, 1, so that any inaccuracies in the motion of the prism carriers 8, 8 will have no eflect on the accuracy of the measurement.

`What I claim is:

1. A double microscope for stereoscopic measuring instruments, comprisingin combination two reflecting systems arranged in the paths of rays of the two halves of the double microscope, each of said reflecting systems being adapted to coact with either of the twofhalves of the double microscope and means for changing over the said refleeting systems from the one path of rays into the other path of rays and vice versa, as and for the purpose set forth.

2. A double microscope for stereoscopic measuring instruments, comprising in combination two reflecting systems arranged in the paths of'rays of the two halves of the double microscope, carriers for the said. reflecting systems,'racks on'the carriers and a changing over the said refiecting systems in lopposition to each other each from the one path of rays into the other pathl of rays, as and for the purpose set forth.

3. A double microscope for the stereoscopic measuring instruments comprising in combination two e '-pieces, twovmeasuring marks, two reflecting systems, between the eye-pieces and'measuring marks, each ofsaid reflectingv systems ,being adapted to coact with eithervof vthe two halves vof the double microscope and means for changing over the said reflecting systems from between the eye iece and measuring mark of one half of the double microscope to between the eyepiece and measuring mark ofthe other half of the doublemicroscopeand vice versa, as and for the purpose set forth..

In testimony whereof I have signed my name .to this specification.

' REINHARD HUGERSHOFF. 

